http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Zhang Yinhang ),박수진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
3-Mercaptopropyltrimethoxysilane (MPTMS)-ethanol solution treated nitrile butadiene rubber/nanodiamond (NBR/ND) polymer nanocomposites were prefabricated. The nanodiamond (ND) and modified nanodiamond (MND) were characterized. The results show that the pristine ND is provided not only with high specific surface area, but also with abundant active organic groups, especially hydroxyl and carboxyl groups, which confirms the hydrophilic properties of nanodiamond. The morphology of the fracture surfaces of NBR/(M)ND nanocomposites are studied by high resolution scanning electron microscopy. The dynamic rheological properties of NBR/(M)ND nanocomposites were characterized by rubber processing analyzer. The NBR/MND composites exhibited superior mechanical property attributing to the stronger interfacial interaction via covalent bonding between MND and NBR molecules.
Zhang, Yinhang,Park, Soo-Jin Elsevier 2018 Composites. Part A, Applied science and manufactur Vol.112 No.-
<P><B>Abstract</B></P> <P>A carbon/carbon hybrid nanofiller based on nanodiamond-decorated graphene oxide (ND@GO) was designed using 4,4′-methylene diphenyl diisocyanate as the coupling agent and incorporated in carboxylated styrene-butadiene rubber (XSBR) for fabricating XSBR/ND@GO nanocomposites. The morphology and structure of the designed ND@GO nanofiller were investigated comprehensively. A modified latex compounding method was employed to fabricate the rubber/ND@GO nanocomposites to ensure a homogenous dispersion of the nanofiller in the polymer matrix, which was confirmed by high-resolution scanning electron microscopy. The mechanical properties, thermal stability, dynamic rheological, and dynamic mechanical properties of the XSBR/ND@GO nanocomposites were studied. The as-prepared XSBR/ND@GO nanocomposites exhibited superior mechanical properties, thermal stability, and thermo-physical properties attributing to special ND@GO structure and stronger interfacial interactions between the filler and rubber matrix.</P>
Zhang, Yinhang,Rhee, Kyong Yop,Park, Soo-Jin Elsevier Science Ltd 2019 Composites Part B, Engineering Vol.176 No.-
<P><B>Abstract</B></P> <P>Polymer-based thermoelectric materials have attracted considerable interest for green energy conversion over the past decades. In this study, polymer/inorganic thermoelectric generators were prepared by integrating film-forming polyvinylidene fluoride (PVDF) and expanded graphites (EGs) to tailor the thermoelectric performance of the resulting PVDF/EG composites by adjusting the expansion volume of EGs with different thermal treatments. The charge carrier rate and phonon scattering are responsible for the divergent performance of the prepared polymer/EG composites. The prepared composites exhibited superior thermoelectric properties, where the PVDF/EG composite containing 20% EG expanded at 600 °C showed an electrical conductivity of 883 S/cm, a Seebeck coefficient of 8.77 μV/K, and a high power factor of 6.79 μW m<SUP>−1</SUP>K<SUP>−2</SUP>. This composite outperforms many other graphene- or graphite-based composites reported in the literature. This study provides a facile avenue to prepare an inexpensive, lightweight, nontoxic, and highly efficient thermoelectric generator for green energy conversion and energy harvesting.</P>
Zhang, Yinhang,Choi, Jang Rak,Park, Soo-Jin Elsevier 2018 Composites Applied science and manufacturing Vol.109 No.-
<P><B>Abstract</B></P> <P>Amine-terminated macromolecular chain (ATBN) were covalently grafted on expanded graphite (EG) surface using 4,4′-methylene diphenyl diisocyanate as coupling agent. The functionalization result of the amine-terminated EG (AEG) was demonstrated by various analysis techniques. The AEG was incorporated into the epoxy (EP) matrix to form EP/AEG nanocomposites by interlayer polymerization in the EG interval layers. The grafted ATBN chains on the AEG surfaces can not only enhance the interfacial adhesion of the filler and EP matrix, but can also act as hardener to react with the EP chains covalently to further toughen the fabricated EP nanocomposites. The thermal stability, thermal conductivity, thermos-mechanical, and rheological properties of the EP/AEG nanocomposites were comprehensively studied. The results showed that the novel-designed AEG can significantly enhance the thermal conductivity of the EP composites. Moreover, the as-designed composites show superior thermal stability and thermo-physical properties, making them potentially useful as thermal management materials in electronic devices.</P>
Zhang, Yinhang,Park, Soo-Jin Elsevier 2018 Composites. Part A, Applied science and manufactur Vol.112 No.-
<P><B>Abstract</B></P> <P>Interfacial interaction is one of the most crucial and dominant factors affecting the performance and behavior of a material. The surfaces of layered expanded graphite (EG) were activated by covalently grafted mercapto groups (-SH), which can readily react with the macromolecular chains of rubber, thus forming a strong interfacial adhesion between the filler and the rubber matrix. Shear-induced mercapto-group-activated graphite nanoplatelets (S@GNPs) were fabricated <I>in situ</I> by compound mixing in a two-roll mill. A correlation between the interfacial interaction and the thermal conductivity, as well as the thermo-physical properties, was comprehensively investigated. The results showed that rubber/S@GNPs composites exhibited better mechanical performance, enhanced thermo-physical properties, and superior thermal conductivity, all of which could be attributed to the stronger interfacial interaction resulting from chemical bonding between the S@GNPs and the molecular chains of the rubber, relative to XSBR/GNP composites connected by weaker π-π stacking.</P>
Zhang, Yinhang,Rhee, Kyong Yop,Park, Soo-Jin Elsevier 2017 Composites Part B, Engineering Vol.114 No.-
<P><B>Abstract</B></P> <P>Novel hybrid fillers composed of nanodiamond (ND) nanocluster-decorated graphene oxide (GO) were fabricated and incorporated in an epoxy matrix using a facile thermoregulatory liquid-liquid extraction method. X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses confirmed a chemical bonding between the (3-aminopropyl)triethoxysilane-functionalized ND and (3-glycidyloxypropyl)trimethoxysilane-functionalized GO. The morphology of the hybrid filler (GN) was characterized by field-emission transmission electron microscopy. ND nanoclusters with an average diameter of 50–100 nm were uniformly grown on the GO surface. The hybrid filler provided significant enhancement of mechanical properties, such as flexural strength, flexural modulus, and fracture toughness. In particular, the epoxy composite containing 0.1 wt% of GN hybrid exhibited a stronger mechanical behavior compared to that containing 0.2 wt% of GO. As the GN loading increased, the thermal stability, the integral procedural decomposition temperature, and the activation energy increased as well. The toughening mechanism was illustrated by a microcrack theory based on the microscopic analysis of the fracture surfaces. The presence of ND nanoclusters not only hindered the aggregation of the GO sheets, but also played a crack pinning role in the polymer-matrix composites, which could significantly enhance its fracture toughness.</P>
Nanodiamond attached-graphene oxide for preparation of epoxy-based nanocomposites
( Zhang Yinhang ),박수진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Hybrid fillers composed of nanodiamond (ND) decorated graphene oxide (GO) were incorporated into epoxy matrix with a novel thermoregulatory liquid-liquid extraction method. Energy dispersive spectroscopy, X-ray diffraction spectroscopy, Fourier transform infrared and X-ray photoelectron spectroscopy analysis confirmed chemical bonding between the 3-aminopropyltriethoxysilane functionilizatied nanodiamond (ND-APTES) and 3-Glycidoxypropyltrimethoxy silane functionalized graphene oxide (GO-GMPTS). The morphology of the hybrid filler, GN was characterized by high-resolution transmission electron microscopy. ND nanoclusters with an average diameter of 50-100nm were uniformally grown on the GO surface. The hybrid filler provided significant enhancement of mechanical properties, such as flexural strength, flexural modulus and impact strength. In particular, the epoxy composites containing 0.1wt% hybrid GN exhibited a higher mechanical behavior compared to the one containing 0.2 wt% GO.
1P-17 Research of nanodiamond/nitrile-butadiene rubber nanocomposites prepared by one-pot design
( Zhang Yinhang ),박수진 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
3-Mercaptopropyltrimethoxysilane (MPTMS)-ethanol solution treated nitrile butadiene rubber/nanodiamond (NBR/ND) polymer nanocomposites were prefabricated in-situ by a novel environmentally friendly one-pot design. The nanodiamond (ND) and modified nanodiamond were characterized by using wide angle X-ray diffraction, Fourier transformation infrared spectroscopy, transmission electron microscopy, an adsorption analyzer (BEL BELSORP), thermal gravimetric analysisis, and X-ray photoelectron spectroscopy. The results show that the pristine ND is provided not only with high specific surface area, but also with abundant active organic groups, especially hydroxyl and carboxyl groups, which confirms the hydrophilic properties of nanodiamond. The dynamic rheological properties of NBR/(M)ND nanocomposites were characterized by rubber processing analyzer. The NBR/MND composites exhibited superior mechanical property.
Yinhang Zhang,박수진 한국고분자학회 2018 Macromolecular Research Vol.26 No.5
This paper aims at correlating the silane treatment of rice bran carbon (RBC) in nitrile butadiene rubber (NBR) matrix with the rheological properties of RBC/NBR composites. The surface morphology and structure of RBC were characterized by X-ray diffraction, thermogravimetric analysis, high-resolution scanning electron microscopy (HR-SEM), Raman spectroscopy, and adsorption analysis. The RBC/NBR polymer-matrix composites were fabricated by using the latex compounding technique, based on the superior hydrophilic characteristics of RBC. The silane treatment process was conducted by in situ interfacial modification technique. The dispersion of RBC and the interfacial morphologies between the RBC and NBR matrix were confirmed by HR-SEM. The bonding mechanism was analyzed in detail by mechanical and dynamic rheological determinations. At the same filler concentration, the (3-mercaptopropyl) trimethoxysilane (MPTMS) treated composites exhibited stronger mechanical properties and higher storage modulus than original RBC/NBR composite, as the interfacial interaction via MPTMS connected RBC and NBR molecules was stronger than the interaction in RBC/NBR composites connected by hydrogen bonds and weaker π-π stacking.